The battle of red cliffs happened in the famous Three Kingdoms era, and the battle did settle the foundation for the situation. At the time the Shu(蜀) and Wu(吴) who were south of Wei(魏) were alliances so you could say it was a battle between south and north, but when we talk about it was more like a mexican standout sort of thing(if that makes sense to you).

Well we do have a period called the Northern and Southern dynasties, but most of the time we are devided into multiple states and it’s hard to tell who is south and who is north, so …